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Control of the Invasive Exotic Rhamnus cathartica in Temperate North American Prairies.. Page 2 of 11 <br />Figure 2. Senescing R. cathartica leaves. Notice characteristic arching pattern of the main branching veins. <br />Figure 3. Lateral spikes along the length of a young branch stand out against the brown, scaly bark <br />background of the trunk. <br />http://wvvw.hort.agri.umn.edu/h5015/00papers/gale.htm <br />2/15/01 <br />